CMD command and NPM command

cmd command

Get into cmd

win key +R Key is to open the running window , Input cmd Access control

The catalog represents compliance

/ Represents the root directory

./ Current directory

../ Upper level directory

cd command

cd Directory name Switch to the corresponding directory

cd ../ Switch to the previous Directory

cd / Switch to the root directory

cd Users Switch to Users Catalog

Tips  

The first letter +Tab Can make up for Corresponding documents / Folder name

View directory

dir View the contents of the current directory

Create directory

md Directory name

md mycatalogue Create a mycatalogue The catalog of

  Delete directory

rd Delete empty directory

rd Directory name  /s  /q
Delete the directory with content

 help

help command   View command usage
help rd see rd Tutorial on the use of commands

type 

type text file
type 1.txt
see 1.txt The content of

del

del file
del 1.txt
Delete 1.txt file

 cls Clear the screen

ipconfig View this machine ip 

View Unicom

ping Host name
ping www.baidu.com Check whether Baidu Unicom

calc Turn on the calculator

npm command

  initial

npm init Initialize project , establish package.json The file of ( All the way back )

npm init -y Quick initialization project ( The options are yes)

Catalog explanation

package.json Project package management documents

package-lock.json Download cache address

node_modules Where to download the installation package

install (install) 

General installation

install jquery    npm i jquery

Global installation

Global installation vue  npm i @vue/cli  -g

The location of the global installation of plug-ins   npm root view -g

  Development dependent installation

Development dependent installation axios
npm i axios -D

  Product dependent installation

The product environment depends on installation jquery
npm i jquery -S

  uninstall (uninstall)

uninstall jquery
npm uninstall jquery

  Version number

 "jquery": "3.6.0" Limit the version range Project use jquery Methods that can be upgraded can not only be greater than be equal to 4.0.0
 "jquery": "2.1" The fixed version is 2.1

Install fixed version

Install the fixing 2.1 edition jquery
npm i [email protected] -S

  to update

to update jquery
npm update jquery